CN114854217B - Biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film and preparation method thereof - Google Patents
Biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film and a preparation method thereof, which belong to the technical field of plastic film preparation, wherein gelatin, glycerol, lignosulfonate, sulfited grease and metal salt solution are taken as raw materials, a film forming liquid is prepared by dissolving, heating and stirring, then the film forming liquid is poured into a mold, and the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film is obtained by cooling, shaping and drying. Through detection, the prepared biodegradable water-repellent ultraviolet-resistant gelatin-based bio-plastic film has excellent mechanical properties, ageing resistance, degradability and water repellency, and solves the problem that the gelatin-based film loses mechanical properties after meeting water due to strong water absorbability in the prior art, so that the gelatin-based film is further applied.
Description
Technical Field
The invention belongs to the technical field of plastic film preparation, relates to a biodegradable plastic film and a preparation method thereof, and in particular relates to a biodegradable water-repellent ultraviolet-resistant gelatin-based plastic film and a preparation method thereof.
Background
The plastic bag made of the plastic film is light, thin, waterproof, high in strength and low in cost, is a good packaging material, brings great convenience to the life of people due to the use of the plastic bag, and enables the consumption of the plastic bag to be larger and larger, but the traditional petroleum-based plastic film is difficult to recover and degrade after being abandoned, and a large number of abandoned plastic bags become a main factor of current environmental pollution. In order to reduce the pollution of the plastic film to the environment, some degradable plastic films are developed.
The degradable plastic film plays a certain positive role in improving the environment. Among them, gelatin has excellent film forming property and biodegradability, and gelatin-based films have been widely used in the fields of food packaging and biomedical. However, the inherent strong water absorption of gelatin causes the gelatin film to lose mechanical properties immediately after meeting water, and the strong water absorption is unfavorable for the gelatin film to be used as a substitute of the plastic film, thus preventing the development of gelatin-based films.
Disclosure of Invention
The invention aims to solve the problem that the gelatin-based film loses mechanical properties after meeting water due to the strong water absorbability of the gelatin-based film in the prior art, and further the gelatin-based film is applied, and provides a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film and a preparation method thereof.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention provides a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film, which comprises the following raw material components in parts by mass: 5 to 10 parts of gelatin, 0.5 to 2 parts of glycerol, 0.1 to 2 parts of Lignosulfonate (LS), 0.5 to 2 parts of sulfited grease and 20 parts of metal salt solution.
Preferably, the molecular mass of the gelatin is 30000-100000.
Preferably, the lignosulfonate is one or more of sodium lignosulfonate, calcium lignosulfonate and magnesium lignosulfonate.
Preferably, the sulfited grease is one or both of sulfited animal oil and sulfited vegetable oil.
Preferably, the concentration of the metal salt solution is 0.005 g/mL-0.25 g/mL.
Preferably, the metal salt solution is one or more of zirconium sulfate, zirconium chloride, ferric sulfate, aluminum chloride and aluminum sulfate solution.
The preparation method of the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film utilizes the raw material components and comprises the following steps:
s1: heating gelatin, glycerol, lignosulfonate and sulfited oil, stirring and dissolving in water to form a mixed solution;
s2: adding a metal salt solution into the mixed solution, and continuously stirring to obtain a film forming solution;
s3: pouring the film forming liquid into a mold, cooling, shaping and drying to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Preferably, the amount of water in S1 is 100 parts, and the temperature of heating and stirring is 40-80 ℃.
Preferably, the stirring time in S2 is 40 min-180 min.
The thickness of the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film prepared by the method is 0.128-0.136 mm, the breaking stress is 25.68-36.06 MPa, the breaking strain is 0.12-0.26 mm/mm, and ultraviolet light with the wave band of 200-400 nm can be completely shielded; the flow rate of the bio-plastic film is 0.1m 3 After one minute of impact of the water flow per minute,the breaking stress is 11.26 MPa-17.58 MPa, and the breaking strain is 0.35 mm/mm-0.42 mm/mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film, which takes gelatin as a base material, and by adding lignin sulfonate, sulfited grease and metal salt, the metal salt forms a metal ligand bond among lignin sulfonate, sulfited grease and gelatin molecular chains, hydrophilic groups of Lignin Sulfonate (LS) and sulfited grease (FOS) are firmly fixed inside a gelatin matrix, so that the crosslinking density of the gelatin-based film is effectively increased, the mechanical property of the gelatin-based film is enhanced, on the other hand, sulfonic groups and phenolic hydroxyl groups of LS or FOS are effectively shielded with carboxyl groups of gelatin, a hydrophobic and low-water adhesion water-resistant interface is formed on the surface of the gelatin film, the interface can effectively resist water immersion after encountering water, and mutual hydrogen bonds among molecules inside the gelatin film are not destroyed, so that the gelatin-based film is ensured to have excellent mechanical property after encountering water.
The invention provides a preparation method of a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film, which is simple, mild in reaction, pollution-free and capable of realizing large-scale production; the thickness of the prepared biological plastic film is 0.128-0.136 mm, the breaking stress is 25.68-36.06 MPa, the breaking strain is 0.12-0.26 mm/mm, and the biological plastic film can completely shield ultraviolet light with the wave band of 200-400 nm; the flow rate of the bio-plastic film is 0.1m 3 After one minute of water flow impact per minute, the breaking stress is 11.26 MPa-17.58 MPa, the breaking strain is 0.35 mm/mm-0.42 mm/mm, and the gelatin-based film has degradability, very good mechanical property, ageing resistance and water repellency, is an innovative technology in the technical field of film preparation, and lays a foundation for development of gelatin-based films.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film of the present invention.
Fig. 2 is a graph showing transmittance of biodegradable water repellent ultraviolet resistant gelatin-based bio-plastic films prepared in examples 1 to 5 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film, which comprises the following raw material components in parts by mass: 5 to 10 parts of gelatin, 0.5 to 2 parts of glycerol, 0.1 to 2 parts of Lignosulfonate (LS), 0.5 to 2 parts of sulfited grease and 20 parts of metal salt solution; wherein the molecular mass of the gelatin is 30000-100000; the lignosulfonate is one or more of sodium lignosulfonate, calcium lignosulfonate and magnesium lignosulfonate; the sulfited grease is one or two of sulfited animal oil and sulfited vegetable oil; the metal salt solution is one or more of zirconium sulfate, zirconium chloride, ferric sulfate, aluminum chloride and aluminum sulfate solution, and the concentration of the metal salt solution is 0.005-0.25 g/mL.
Referring to fig. 1, the invention provides a preparation method of a biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film, which utilizes the raw material components and comprises the following steps:
s1: heating gelatin, glycerol, lignosulfonate and sulfited grease, stirring and dissolving in 100 parts of water to form a mixed solution; the temperature of heating and stirring is 40-80 ℃.
S2: adding a metal salt solution into the mixed solution, and continuously stirring for 40-180 min to obtain a film forming solution;
s3: pouring the film forming liquid into a mold, cooling, shaping, and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
The thickness of the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film prepared by the method is 0.128-0.136 mm, the breaking stress is 25.68-36.06 MPa, the breaking strain is 0.12-0.26 mm/mm, and the bioplastic film can completely shield ultraviolet light with the wave band of 200-400 nm through test; the flow rate of the bio-plastic film is 0.1m 3 After one minute of water flow impact per minute, the breaking stress is 11.26 MPa-17.58 MPa, and the breaking strain is 0.35 mm/mm-0.42 mm/mm.
Example 1
5 parts of gelatin, 1 part of glycerol, 0.5 part of sodium lignosulfonate, 1 part of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 50 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.005g/mL ferric chloride solution into the mixed solution system, and maintaining the temperature at 50 ℃ for continuous stirring for 60min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 2
10 parts of gelatin, 2 parts of glycerol, 1 part of sodium lignosulfonate, 0.5 part of calcium lignosulfonate, 0.5 part of magnesium lignosulfonate, 1 part of sulfited vegetable oil and 100 parts of water are continuously stirred in an environment of 40 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.1g/mL ferric chloride solution into the mixed solution system, and maintaining the temperature at 40 ℃ and continuously stirring for 180min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 3
5 parts of gelatin, 1 part of glycerol, 1 part of magnesium lignin sulfonate, 0.5 part of sulfited vegetable oil, 0.5 part of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 60 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.15g/mL aluminum chloride solution into the mixed solution system, and maintaining the temperature at 60 ℃ for continuous stirring for 100min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 4
10 parts of gelatin, 2 parts of glycerol, 1 part of magnesium lignin sulfonate, 2 parts of sulfited vegetable oil and 100 parts of water are continuously stirred in an environment of 70 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.15g/mL aluminum chloride solution into the mixed solution system, and maintaining the temperature at 70 ℃ for 50 minutes to obtain a film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 5
5 parts of gelatin, 1 part of glycerol, 0.1 part of sodium lignin sulfonate, 0.5 part of sulfited vegetable oil and 100 parts of water are continuously stirred in an environment of 80 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.005g/mL zirconium chloride solution into the mixed solution system, and maintaining the temperature at 80 ℃ for continuous stirring for 40min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 6
6 parts of gelatin, 1 part of glycerol, 0.7 part of sodium lignin sulfonate, 0.6 part of sulfited vegetable oil and 100 parts of water are continuously stirred in an environment of 50 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.2g/mL aluminum sulfate solution into the mixed solution system, and maintaining the temperature at 50 ℃ for continuous stirring for 60min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 7
8 parts of gelatin, 1.5 parts of glycerol, 1.3 parts of calcium lignosulfonate, 0.3 part of magnesium lignosulfonate, 0.6 part of sulfited vegetable oil, 0.7 part of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 60 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.17g/mL aluminum sulfate and aluminum chloride mixed solution into the mixed solution system, and maintaining the temperature at 60 ℃ for continuous stirring for 80min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 8
Mixing 7.5 parts of gelatin, 0.8 part of glycerol, 0.1 part of calcium lignosulfonate, 0.6 part of magnesium lignosulfonate, 0.6 part of sulfited vegetable oil, 0.6 part of sulfited animal oil and 100 parts of water in an environment of 60 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.17g/mL aluminum sulfate, zirconium sulfate and aluminum chloride mixed solution into the mixed solution system, and maintaining the temperature of 60 ℃ for continuous stirring for 70min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 9
9 parts of gelatin, 1.7 parts of glycerol, 0.3 part of sodium lignin sulfonate, 0.6 part of magnesium lignin sulfonate, 0.9 part of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 55 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.25g/mL aluminum sulfate, ferric chloride, ferric sulfate, zirconium sulfate and aluminum chloride mixed solution into the mixed solution system, and maintaining the temperature of 55 ℃ for continuous stirring for 120min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 10
Mixing 7 parts of gelatin, 0.8 part of glycerol, 0.3 part of magnesium lignin sulfonate, 0.8 part of sulfited animal oil and 100 parts of water in an environment of 55 ℃ continuously until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.075g/mL aluminum sulfate solution into the mixed solution system, and maintaining the temperature at 55 ℃ for continuous stirring for 110min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 11
8.5 parts of gelatin, 0.9 part of glycerol, 0.3 part of magnesium lignosulfonate, 0.4 part of calcium lignosulfonate, 0.8 part of sulfited animal oil, 0.3 part of sulfited vegetable oil and 100 parts of water are continuously stirred in an environment of 59 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.008g/mL aluminum sulfate solution into the mixed solution system, and maintaining the temperature of 59 ℃ for continuous stirring for 130min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 12
9.5 parts of gelatin, 0.8 part of glycerol, 0.6 part of magnesium lignin sulfonate, 0.6 part of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 55 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.016g/mL aluminum sulfate solution into the mixed solution system, and maintaining the temperature at 55 ℃ for continuous stirring for 150min to obtain a film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
Example 13
6.6 parts of gelatin, 1.4 parts of glycerol, 0.2 part of magnesium lignin sulfonate, 1.6 parts of sulfited animal oil and 100 parts of water are continuously stirred in an environment of 53 ℃ until all components are completely dissolved to form a mixed solution; adding 20 parts of 0.22g/mL ferric sulfate solution into the mixed solution system, and maintaining the temperature of 53 ℃ for 160min to obtain film forming solution; pouring the film forming liquid into a mold, cooling, shaping and naturally drying at room temperature to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
The biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic films prepared in the above examples were each tested for mechanical properties according to the method specified in ASTM D882-09 (2009). The test results are shown in the following table:
from the table, the biodegradable water-repellent ultraviolet-resistant gelatin-based plastic film prepared by the embodiment has excellent mechanical properties and can be used for replacing the traditional petroleum-based plastic film.
Referring to fig. 2, using examples 1 to 5 as an example, the prepared biodegradable water-repellent ultraviolet-resistant gelatin-based bio-plastic films were respectively subjected to ultraviolet resistance test. The ultraviolet blocking ability of the prepared film was evaluated as light transmittance in the range of 200 to 800 nm. The prepared biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film has excellent ultraviolet blocking performance and can completely shield ultraviolet light wave bands (200-400 nm).
In order to test the water resistance of the biodegradable water-repellent ultraviolet-resistant gelatin-based bio-plastic film prepared by the present invention, examples 1 to 5 are exemplified by continuous water impact on the prepared biodegradable water-repellent ultraviolet-resistant gelatin-based bio-plastic film, respectively, with a water flow rate of 1m 3 And (3) per min, wherein the impact time is 1min, and the mechanical property of the water flow after impact is tested. See the following table:
| sample of | Fracture stress (MPa) | Breaking strain (mm/mm) |
| Example 1 | 16.21±3.12 | 0.35±0.02 |
| Example 2 | 12.12±1.23 | 0.40±0.04 |
| Example 3 | 17.58±2.13 | 0.36±0.05 |
| Example 4 | 15.24±2.15 | 0.38±0.06 |
| Example 5 | 11.26±1.86 | 0.42±0.05 |
From the results of the table, the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film prepared by the invention has excellent water resistance, has excellent mechanical properties even after being impacted by continuous water flow, and can be suitable for application in various wet environments.
The biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film prepared by the preparation method in the above example was subjected to biodegradation test. According to the degradation method specified in GB/T19277.1, the film prepared by the method can be completely biodegraded.
In conclusion, the preparation method of the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film provided by the invention is simple, the reaction is mild and pollution-free, the prepared biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film has very good mechanical property, ageing resistance, degradation performance and water repellency, can meet the mechanical requirement and water repellency requirement of actual production life on the degradable plastic film, has no pollution, can realize the replacement of the traditional petroleum-based plastic film, and is an innovative technology in the technical field of biodegradable film production.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film is characterized by comprising the following raw material components in parts by mass: 5-10 parts of gelatin, 0.5-2 parts of glycerol, 0.1-2 parts of Lignosulfonate (LS), 0.5-2 parts of sulfited grease and 20 parts of metal salt solution; the metal salt solution is one or more of zirconium sulfate, zirconium chloride, ferric sulfate, aluminum chloride and aluminum sulfate solution, and the concentration of the metal salt solution is 0.005-g/mL-0.25-g/mL.
2. The biodegradable, water repellent and ultraviolet resistant gelatin-based bio-plastic film according to claim 1, wherein the molecular mass of the gelatin is 30000 to 100000.
3. The biodegradable, water repellent and uv resistant gelatin-based bio-plastic film according to claim 1, wherein said lignosulfonate is one or more of sodium lignosulfonate, calcium lignosulfonate and magnesium lignosulfonate.
4. The biodegradable water repellent uv resistant gelatin based bio plastic film according to claim 1, wherein said sulfited grease is one or both of sulfited animal oil and sulfited vegetable oil.
5. A method for preparing a biodegradable water repellent ultraviolet resistant gelatin based bio-plastic film, characterized by using the raw material composition according to any one of claims 1 to 4, comprising the steps of:
s1: heating gelatin, glycerol, lignosulfonate and sulfited oil, stirring and dissolving in water to form a mixed solution;
s2: adding a metal salt solution into the mixed solution, and continuously stirring to obtain a film forming solution;
s3: pouring the film forming liquid into a mold, cooling, shaping and drying to obtain the biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film.
6. The method for preparing a biodegradable water repellent ultraviolet resistant gelatin based bio-plastic film according to claim 5, wherein the amount of water in S1 is 100 parts, and the temperature of heating and stirring is 40 ℃ to 80 ℃.
7. The method for preparing a biodegradable water repellent ultraviolet resistant gelatin based bio-plastic film according to claim 5 or 6, wherein the stirring time in S2 is 40min to 180min.
8. A biodegradable water repellent ultraviolet resistant gelatin based bio-plastic film prepared by the method of any one of claims 5 to 7, wherein the bio-plastic film has a thickness of 0.128mm to 0.136mm, a breaking stress of 25.68MPa to 36.06MPa, a breaking strain of 0.12mm/mm to 0.26mm/mm, and can completely shield ultraviolet light with a wave band of 200nm to 400 nm; the flow rate of the bio-plastic film is 0.1m 3 After one minute of water flow impact per minute, the breaking stress is 11.26 MPa-17.58 MPa, and the breaking strain is 0.35 mm/mm-0.42 mm/mm.
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| JPH0578207A (en) * | 1991-02-26 | 1993-03-30 | Nippon Kayaku Co Ltd | Packed material of agricultural chemical formulation for submerged application packaged with water-soluble film |
| WO2009143425A1 (en) * | 2008-05-22 | 2009-11-26 | The Regents Of The University Of California | Membrane precursors and membranes formed therefrom |
| WO2017214187A1 (en) * | 2016-06-07 | 2017-12-14 | Aridis Pharmaceuticals, Inc. | Method for preparation of quick dissolving thin films containing bioactive material with enhanced thermal stability |
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| WO2009143425A1 (en) * | 2008-05-22 | 2009-11-26 | The Regents Of The University Of California | Membrane precursors and membranes formed therefrom |
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